<x xmlns:n1="urn:p1" xmlns:n2="urn:p2" xmlns:n3="urn:p3">

  <n1:y1>
    <z1 n2:a="v">
    </z1>
  </n1:y1>

  <y2 xmlns="urn:pd2">
    <z2 xmlns="">
    </z2>
  </y2>

  <y3 xmlns="">
    <z3 xmlns="">
      <!-- a comment -->
    </z3>
  </y3>

  <y4 xmlns="">
    <z4 xmlns="urn:pd4">
      [CDATA[ some cdata contents ]]
    </z4>
  </y4>

  <n1:y5 xmlns="urn:pd5">
    <n2:z5 xmlns="urn:pd1">
      <n2:zz5 xmlns="">
        <n2:zzz5 xmlns="">
        </n2:zzz5>
      </n2:zz5>
    </n2:z5>
  </n1:y5>

</x>
